[1] Charles Univ Prague, Fac Med 1, Prague, Czech Republic
[2] Gen Univ Hosp, Dept Med 4, Prague, Czech Republic
[3] Lnstitute Clin Chem & Lab Diagnost, Prague, Czech Republic
[4] Charles Univ Prague, Fac Med Pilsen, Fac Hosp, Dept Paediat, Plzen, Czech Republic